In spite of the current closure of theatres and concert halls in the UK, we can still enjoy online streaming as follows.
National Theatre
Enjoy world-class theatre from the National Theatre, which you can view online every Thursday evening at 1900 GMT in April and May.
https://www.youtube.com/user/ntdiscovertheatre/featured
Royal Opera House
The Royal Opera House is offering a free programme of curated online broadcasts. Full-length productions, musical masterclasses and glimpses behind the scenes can be viewed free of charge anytime and anywhere across the globe. For further details please visit https://www.roh.org.uk/
Shakespeare’s Globe
While the theatre is closed, you can enjoy free YouTube Premiers. For further details please visit https://www.shakespearesglobe.com/watch/#free-youtube-premieres
Royal Albert Hall
The Royal Albert Hall will celebrate its 150th anniversary in 2021, but the hall is currently closed for the first time since World War II. In these extraordinary times, Royal Albert Home will see artists sharing their work from their homes to yours.
https://www.royalalberthall.com/tickets/series/royal-albert-home/